Electric switch



Jan. 29 1924.

W. P. DRYER ELECTRIC SWITCH Filed May 3, 19420 Fig. I.

Inventor William PDPHer, b5 .422,14

His Aitor-neg.

Jan. 29 1924. 1,481,832

W. P. DRYER ELECTRIC SWITCH Filed May 3, 1920 2 Sheets-Sheet ateiitedJan. 29, 1924.

UNITED STATES i 1,481,832 PATENT orrice.

WILLIAM POOLE DRYER, OF SCHENECTADY, NEW YORK, ASSIGNOR' TO GENERALELEC- TRIC COMPANY, A. CORPORATION OF .NEW YORK.

ELECTRIC SWITCH.

'.lippncanon filed May a,

To all. whom it may concern:

Be ilv lc'nown that I, VVILLIAALP. DRYER. n subject of the King ofGrcat'ritain, residing nt- Sclienectedy,'- county of Schenectady, Stateof New York, lieve invented eer'- tain new and useful Improvements inEleccertain conditions;Vv

tric Switches, of' which tlie following is i specification. l y

4My invention relates to electric switches,

particularly to switches of the combined'oil und nirbreek type and hasfor its object to combine in one switch structure :in air break switchelement and anloil break Switch ele# ment adapted to be operated in adefinite sequence orf operated indlepen'dentl'yY under It is oftendesireible vvto" connect en oil break switch to afso'uroeof 'poweror'spply through an eirbreak or disconnecting s'v'vitc and in' suchl'ceses,"underl present p'rctice`,'- it is customary to use independentswitches for Ir'rY the ii'ov'el form' of `switch of my invention, I,combine in nne unitiry switch'structure enloil'breal or switch element'with 'that of 'enfuir breek 'x iliury switclielement?.` A'In vt'li'e"\`se"o'f power installtions `tlie' current "alvi'e'y's: 'iii-5lterrupted at the main'sivtcli'contects. 'Ilie", principal ii'uiictionsVof' the f'au'xilie'i'y break' are vto insulateItlife'-,in`z`iin=I's'iiriic'ilistiiicture this purpose."

n visible .break so; th'at 'thisfilfac't inply' be; definitely and''quickly' deteini'ned kcor'ding to theinter-relatif oft-lie',-Iti'voj'sv'ifitcli'" elen'ients, the 'guit'iliry' switch element 4`i's:ida pted' to be controlled ,b'y'tbe' inein switch element in such In.Yway that the eii'i'rilieryelementV is operated toopen'its contacts-afterthe main `contacts' open' sind' closes 'its com;

cuit opening or cl'osing'position indelgie'i'i'dent` of the mainsii-'itch' element.'

The novel,-etures which I .believe to be chiiracteristic ofi'nvinvention' will be definitely indicated in tlie .claims appended heretowhile the features of. 'constructionl an model -of peifnti'on will 'beunderstood by reference to the following description, taken iuconnection with" the 'ecconip'enyindrawings whcli'show thepreferred emboments of'niy invention'andin which:

Figure 1 shows in side elevation, a. switch if' desired, the mein switchele-2' d 2 coinp'ris'es cooperating*iix'd'fzind' auxiliary contcts" 13and M resp 192e. semi No. 378,418.

embodying the features of my invention iii its circuit opening position;Fig. 2 is a4 side the switch mechanism in the position shown lin in Fig.2, 'n'ndFig '4. is e fragmentary 'sectional view taken on the line4.-.-4 of F ig'. 1 As shown in Fig. 1, I provide,' combined in a-singleunitary switch structure,4 n main or oil break switch element `1V undan'a'uxl iliary' 'or air break switch element 'In describing the tivoelements of my' switch as main and auxiliary' elements, I desire it'understood that Ius'e"tliese terms in the broiiclest'meenin'glTlie'inoin'sivitcb' eleinent 1A comprises cooperating and"'ii'ioi'f'ible contacts 3' and 4 respectively; sep''rable' bei neat-h"the 'Surfce'mof nndn'sulntingfuid; such .nsfiL'leontiiiiiedin;'afvess'el `The movable contents' 4 iieconnectedbytlie'iisul bridgnv4inei'iiberz'*'stij-i`jif'id t one:l encl'z'of a' ionginlinauy menig-mafegthezrfi Q .efyff ing' the' movable contacts 4: into 'fend 'oiit ofengagement with' ied'coitaets :3'l byfm'eens ofen o'lfi'erf'i'tii'ii'grineclinisiiif .W Aop' .ij'iitiiig" meelanism'l'is oftle 'i'i'si'iz'il'an'd'in'zt'lie einbodir'nei'it`slio"1iz'i'i""`, 'A z i' maii'il opi"erating i meiber' 71" pi'votfillyf-.itio'i'intd-n .iiisupporting-freine?. sf-nii @espece be mo've'dbya 'usuali 'r'i'n'o'solenoidioperatingi mech'anisii; A:is'sli'oif'j whicl isI cil-# cuitclosing' position: 'e'et s''pyiorted in 'unstableequilibi1fi'iti"=iiy"'n' 'suitablemliitcli'- ingj'ine-iis'- nii-'toggleThe' releisefof, tlie latehig niearis`,tli ei'i 'permits the movement ofthe operating xr'i'ei'nberT to cir'c'it opening position. i Carried' byflie'oil vessel 5 'are tlie' usual termin'l'rods'for members9ffoi-"tlie' inain switch elemenQ'conIiected to {ijqedoon'fl' tacts' 3-and sii'pportedfbyjthe iis'alinsulak ing' f 'bushingsg Tlie' "m'iiiopveijffitingri'meme- I separable in ail". The fixed aiiiili'sirjfcon-'1 jies' tacts 13' are shown; by ive'yhoflex'ariiple; es'

of the lainiiii'cted'brushtye'-and aregfcon'- nected directly 'tofthecon uctii'igmembers or plates 15 carried by insulators'16.` Connectedalso to men'ibers 1 5 are tht` main terminals 17 for the switch. Themovable auxiliary contacts 14 are carried at the end of contact carryingarms or movable blades 18 and are resiliently supported thereon bysprings 19. The arms 18 are pivotally mounted on the tern'iinal membersEl for the main switch element 1 and in electrical connection therewith,a goed electrical connection being insured by the auxiliary connce tions2 0. The movable blades 1S are biased to circuit. openiuvr position bysprings 2l and are connecte for siniultaneous movement by an insulating1inli'22- which serves to insulate the arms 1 8 from each other. Theauxiliary or disconnecting switch elef ment 2 therefore has its contacts13 and 14 in series with the contacts 3 and 4 of the main or circuitbreaker element 1 and lol: @fied intermediate the main. contacts and the17 for the switch. Theenerg-y o f the .circuit iS interrupted. by themain element 1. Whereas. the auxiliary element 2 interrupts no energybut merel31 removes potential frointlie main switch element:A

' For. controlling the auxiliary switch conf ,acts- 13l and 14, providean, auxiliary operatin .mechanism comprising. ari auxiliary o r. belcrank lever 23. pivotally `su ported tlf-f @ae-ShaftQ/,t and .having aaexten ed arm 2 5 proyided near its end with a hole or openingl, asbestl` s lioivn. in Fig. 3. The bell crank lever. 23 1s biased tocircuit openiilg @Sitios by means 0f: a. Spring 27- Suvroun ing slraft 24 -but is prevented from moving too rapidly in circuit opening d iFreetiorr by a time. delay device such as a dash pot 2 8=p1 v o tally.supported o n the frame 8. The plunger. of the dash p ot 2S is connecteda shaft 2 9 to the arm 25 of lever 23, and arran ed so that movement oflever 23 is retarde `in circuit o )ening direction but not in circuitclosing;r ireetion. The lever' 23 is connected to one of the contactblades 18 through an insulatin link 30 which serves to insulate theswitc i blades from the operating mechanisu'i. The arm 25 of lever 2,3Iterminates in a handle member 31 by means of which independent movementof the auxiliary switchl mechanism may take p lace. The arm 2 5 alsocarries, extending at right angles to the handle 3l, an arm 32 having anopening 33 therein, best shown in Fig. 3. Depending from arm is a lug3,11- adapte-d to cooperate with lug 12 of arm 10, as will be described.

Mounted adljacent arm 25 and pivotally supported on t ieshaft 2;4 is,anauxi iary operating lever or mem er 3.5 forthe auxiliary operatingmechanism, asbest shown in Fig. 3. Member 3 5, provided at its. free endwith@ opening orA hole S- alerted to. reefisferlwth the opening 2610iaryl 2.5f The @pantala member 3.5 also Carries a roller.-

hearing 3T cooperating with the engaging surface of arm 10 as will bedescribed.

The auxiliary operating member 35 is controlled by the main operatingmember 7 of switch element 1 by means of the control arm 10 and itsplane engaging surface 11 which cooperates with the roller bearing 3T.In movingr the main operating member 7 from the position shown in Fig. linto switch closing position, shown in Fig. 2, its initial movementcauses the plane surface 1l of arm 1() to engage the roller bearing 37of the auxiliary operating member 3o and in ove memberv 35 into circuitclosing position, prior to the closing of the main contacts `3 and 4.Further movementV of the main operating member 7 to circuit clos? ingposition causes the plane surface 11 of arin 10 to move freely. underthe roller bearing 3l .tothe position Shown. in Eis.. 2.., in whichposition' the arm -1() 4 serves; to hold,

the. arm 3 5 in. Circuit closing PGSitiQn- In Opening the. Switch, theplane Surface lil is so shaped that it holds the auxiliary oper, atingnielnber 35. in its circuit ClOSillg position until after the maincontacts 3 and 4 have Senarated whereupon during the final movement ofthe main operating member tov circuit. Opening- POSbion., the. lanesurface. 11 is. n ioyedfree o the miler. ear'- ing 3,? and; operatingmember 35 is' fleetonrove to circuit openingY position. A

The. auxiliary Operating rlflefrlblr-v 35 a- Cordins t0. my inventioniS-'detachably- Se cured to its operating mechanism for the auxiliary:svvitcli,v element 2 or to. 4the bellcrank leven 2,3 by- Ineans ofl aremovable pinv 38 adapted to be inserted in the opening 26 of bell crankarm 25v and opening 36 of .operating member. 35'. lVith the' pin 38yinseifted. in these openings, `as best shown in Fig. 3, auxiliaryoperating member 35 is rigidly. connected to arm 25 of the bel-l cranklever. andthe auxiliary switch contacts- 13 and. 14eA are therebycontrolled bymember. 35. in response to the main switch element l or.operating member 7 so that the main and auxiliary contacts are openedand closed in the definite sequence described. "The pin 3 8 terminatesin a wing nut 3 9, to which is secured a. yoke 40. The yoke 40 isprovided to cooperate with, arms having openings therein through whichpadlock may be inserted to prevent the removal of. the pin lu'unauthorized persons. In the arrangemeut shown in Fig. 3, operating arm35 carries an extension 4l hav-ingan opening 4:?. therein. Yoke 40.ismovod overextension 41 so that a lock inserted. in openingt 42 holdsthe; yoke 4 0' in position and pnevents. the. removal of: the pin 38.

Should. it be desired, however, to operate the main or oil break .switcheleirrpiinit.l independent of tlic auxiliary air break 'switch element2, it is only necessary to remove the pin 38 from openings 26 and 36- sothat the auxiliary operating member 35 is detached from bell cranklevel' 23 and its mecha` nism. The operation of the main operatingmember 7 under these conditions, operates the auxiliary operating member35 as before, but as member 35 is not connected to the bell crank arm25, the member 35 merely moves idly without affecting the auxiliaryswitch element.

lFor various reasons, it may be desirable to hold'or lock the auxiliaryswitch element 2 in either its circuit opening or closing positionsindependent of the main switch element 1, and for this purpose I providemeans comprising a frame member 43 preferably part of the switch supportand located adjacent the ends of arm of bell crank lever 23 and the endof auxiliary operating member.l 35.- T'his frame 43 is provided with twoopenings or holes 44 and 45. Opening 44 is in alignment with opening 26in arm 25 when the arm is inv circuit closing position and opening 45 is.inalignment wlth opening 26 ywhen Qthe arl'n-y is in its circuitopening position-.'-wTo lock' or. hold the auxiliary switchelement'ft,there-v fore, in its circuit closing positiomitfis-onlynecessaryl to insert pin 38 rom the front, of frame 43 so that it.extends through openl ing 44 therein and-through opening-.26 inarm 25.The auxiliaryswitch-.element 2 is thereupon'heldinoperative and indendent: of the main switch element 1 which is, how-f over, free to openand close.:!;-Tofholdthe pin 38 in positon,.its yoke 40.-.i`s ,slippedover.

may be inserted infopeni'n'g. 33 ofthearmn' To lock thef 4auxi-laryswitch element '1" in:r its circuit opening, .position'pinv 3,8.;isfin-jsex-ted in opening 45 'ofi-frame 43-` and open-7 ing 26 of arm25-wher`euponthe auxiliary.; switch element is-V held inperativeandiii-- dependent of the main switch element. .-Ifr desired, theauxiliaryt operating. member' 35 1 may also be locked in its circuitclosing posi` tion by extending `the pin 38 toengage opening 36 of themember 35.- 5 .4; s In -order toprevent the' unauthorized closing of-the auxiliary switch element 2 by ther handle 31 when the main switchelement is closed, I provide aninterlocking means.. which 'comprises thelug 12 on control arm-` 10 and lug .34 on the armv 25.r With themain'switcli element 1V iii circuit'openingr position, as shown'in'Figi'15, the auxiliaryy switch element 2 may'be openedfand-closedf. atwill byhandle 31. Should, however,= ther: main switch element 14 berolosed, lug12S moves into the'path of4 lug 34,-sotl1atthelifting of-handleA 31' to-close 'thee auxiliary switch element moves lugl 34 into engagement withlug 12 andthe closing of the auxiliary switch element is prevented.Suppose both switch elments Land 2 are closed, as shown in Fig. 2, ifthe handle 31 is moved in an attempt to open the auxiliar switchelement, lug 34 immediately strikes lug 12 on'arm 10 and the auxiliaryswitch is prevented from opening.

I also provide a means for locking the main switch element 1 in itscircuit opening position which consists of an arm 46 carried by thesupport 8 and provided with two openings 47 and 48. As best shown in Fig1,-the pin 38 is'inserted through opening 42 in extension arm 4l'carried by the auxiliary operating member and through opening 47 in arm46 to lock the auxiliary operating member in its circuit openingposition. The yoke of pin 38 is put over the end of arm 46 and a lockadapted to be lnserted in opening 48 to prevent the un,- authorizedclosing of the switch. Should an attempt be made to close the mainswitch element 1, theend of control arm 10 strikes the roller bearing37, and, as member 35 is locked in position', the Lroller bearingprevents'the mam switch element from moving.

to.,circuit closing positioA A U What I- claim as new and desiretosecure4 by Letters 4Patent of. the-United States, is f- .1.- Anelectric.` switch. comprising two co-V operating sets of contactsconnected -in series, one -set of contacts separable, in oil and theother .-setiof.- contactst separable 'in air," an.

. mechanism tor- ;each. =set ofconftacts, an -nieansforatwillrendering'the operatingmechanism 'for Said air .break-com tactsloperative in, .response to 1 the. operating operatinor I mechanism-forsaidfoil 'break'contacts in a.

definite sequence orc for- -holding the operatlng mecbanismjor said ai'rbreakicontacts in openor closed-position independentA of the operatingmechanism for; said oil break conv2. A11 electric switch comprisingalcircuit breaker element having contacts-separable=inv oil, Vanoperating mechan'ismttherefor, a; dis.- connecting switch elementmounted on 'the terminals of -said -circuit .breaker element.

having contacts .separablein air, andvmeans; for voperatlngT saldrswltch-element 1n re} sponseato -the l'operation .ofjsaid circuit breakerelement whereby said elenien-ts are opened and closed in' a definitesequence; and means for at'willholding said ,switchelement in openor-closed positionfindependent of themovementof sa-idcircuit breaker,ele- 3;- 4elect-ric; sivitch comprisin te: lmainv operating'member,contacts control ed; there.. by,-.anlar1'n carried by saidlnember, anauxile iaryoperating memberfbased gtocircuit. opening ;.po sit1on =`butmovable 4to closing`I in response .toj the intial movement.

position element for moving saidauxiliary element to circuit. closingposition priorto the closure of said mainelement and holdingr sai'daux-liary element ineffective to move to circuit opening position until'subs lle-nt to the opening of said nin-in elemen t` anc means 'ffor-atwill holding said auxiliary element in open or closed positionindependent. of said main element.

5. In combimition` two separate switch elements, one having contactssepara-ble in oil and; the other having contacts separable in air, saidcontacts being connectedv in series, an operating member for said airbreak element controlled by said oil; break element, mea-ns operativc inresponse tosaid oil break element for moving said operating member tocircuit closing position prior to the closure oiseid oil break holdingsaid operating member' in circuit closingposition 'un 'i1 said oil breakelement has moyedto circuit-opening 'tici-1, and a mechanism for saidair-bres element detachably secured to said operatinV member fonct willmaintainn said air 'reak ele ment independent of said oil break element.

6; Am electric switch compri-sing main contactisI separable 'in oili,-amain operatingl mechanism for said contacts, terminalmembers for-saidswitch, auxiliary* contacts intermediate said terminals and said maincontactsseparablev in air, an auxiliary mechanismfor' controlling' saidauxiliary cont-acts and means carriedl by said main operating mechanismfor causing said auxiliary mechanism t'o close said auxiliary contactsprior to the closin of said mai-n contacts and for holding said'-auxiliarymechanism in closed position until said maincontacts haveseparated. y

7, In combinationA with a main switch comprisingcontacts separable inoil, :i main operating member for saidI contacts, an arm carried bysaid' member,` and terminals for said switch, of an auxiliary switchcomprisin movable contact carrying. members pirots. ly mounted on saidtermina-1s; fixed conan auxiliary operati-ng member for said auxiliaryswitch held in circuitclosing positionl by said armuntil' said mainoperating member has moved 'to circuit opening positlon, said auxiliaryelement and' for operating member being muvabhl to cis-"uff: openingposition prior to the closure of safe! main switch, au operatingmechanism for' sai-d second switch clement detachably secured to saidoperating lever.

8. An electric switch comprising main contacts separable in oil. a marinoperating member controlling said contacts, a second operating membercarryingr a roller bearingr anrl biased to circuit opening position, anarm carried by' said mainv operating member terminating iu n planeengaging surface which coopera-tes with said roller bearing to more saidsecond operating member to circuit closin'g position, said arm acting tohold said second operating member position until said main operatingnuernbermoves t-o circuit opening position, amecha nism controller] bysa-id secondi operatingr member, and auxiliary contacts-'controlled bysaid mechanism separable in air.

9. .\n electric switch comprising contacts separable in air, a mechanismcontrolling;l said contacts, an operating member detacliably secured tosaid mechanisnna second set of contacts separable in oil', a mechanisniVfor controlling said second set of contacts inf clucllnga separateoperating member, means carried by-said" separate operating member formoving said first opereting"memberto cause said contacts to openand-"close in adeniteseqnence, and mea-ns for lockingthe mechanism forlsaidf oir break Vcontacts in: open or closed position iindepend'entefthe operation of said separate operating member.

10. In an electric switch, the combination' with cooperati-n'fn fixedand movable main' contactsse arable in oil, an operating-'mennbercontrol ing`v saidf contacts, an arm carriedby said member andterminating: in af plane engaging surface, terminal! members' con?nected tozsa-id fixed'. contacts, auxiliary movable contacts: pivotall-mountedton said'tenminal members, fixer: contacts cooperatingwithsai-d" movable auxiliary contacts, auxiliaryoperatingr member-.for saidanariliary contacts having a roller bearing enfgagng said plane surfaceto holdsaid' anxi iliary member in circuit closingnpositon, saidauxiliary member being biased' to move tocircuit opening;r position whensafidfpl-ani: surface iscarried by said nam to circuit opening position,anda mechanism control! ling said? auxiliary contacts detachably securedto said auxiliary operating member.

11. In an electric switch, tlie combination with a main switch 'elementcoliiprisingcon-g tacts separable in oil, and an operating mechanismcontro-lling said contacts-including an operating member, of' anauxiliary switch mechanism 'carried -by said main switchelementcomprising-co-ntacts sepa:- rable in air, an' operatingmechanism4foon-- trolling said auxiliary switch element, Said in circuit closing`operating v mechanisms' being so interrelated? that the main switchelement opens prior to the openin of said auxiliary switch element and coses after said auxiliary switchelement closes, and means for lockingsaid auxiliary' -switch Velement in' 'openl or closed' positionindependentof said main switch element. p

12. An electric"switch comprising-a main l switch` element havingcontacts separable in oil, an operating mechanism controllingsaidcontacts, an auxiliary 'switch element havinghcontacts separablein air,means' for movingr saidauxiliary switch element to cir-v cuit openingposition in response to 'the final movement of said operating mechanisminto circuit opening position and for moving said auxiliary-switchel'en1ent. tocircuit closing position in 'response to the initialmovement of saidmechanism in circuit closing direction, and'means'operative' to hold '.said auxiliary switch element in either open orclosedposition independent' of said main switch elementi! a5 l13. Ainielectricswitch "comprising" two switch elements.' oneseparable-underoil' and` the other' 'separahle in-fa'ir, meansfor electiing the operation 'of said' "air bre'a'kelementi in response to the'operation"offsaidfioil" break element to cause 'said elements tr'jfierEand close in a'definite- 'sequence,-"i`eans for preventinnr ment whilesaidair break element'1 is open, and means'ffor preventing the'closre'of-' said air break elementfwhenfsaitloil '-bra element isclosed.

14. An electrict switchcoinprsing a "cur-'j rent interrupting'switchielemen and a dis-'1' i: connecting switch elemental-'andmechanisxm 4.0 connecting said 'eleents fw'hich 'will icaus'e' i 'the'closure vof the "disconnecting switch' elei' ment before the closureofthe current nterrupting element and permit the'. disconnect-f ingelement, to open only' after-the opening 4.5 of. the current'interrupting element-.'-

' 15. An eleetlics\vitch comprising a current interruptinor switch'element and ay disconnecting'switch element, the latter element beinbiased to open position and mechanism will cause the' closure'cfsaiddisconi 1nectin element and the subsequentfclosure? of sai currentinterruptin element and" will cause the opening of sai current4interrupting element and permit-the'subsequent 56 openin of thedisconnecting element.

i 16. switch comprising' a' main" switch element and an auxiliary switchelement,-I the latter element' being'biased to open "position,connecting means between said eleco ments Vwhich will4 'operate to-cause said' `auxiliary element 4toclose and4 subsequently to causesaid-main" elementV to close and will cause said main element toopen'and subsequent!)1 will permit said-auxiliary element 66 to open, andmeans for rendering said couso whic theclos'ure-of said oil break'elel"necting means .inoperative-,to cause mme ment of said auxiliary means.

17. A circuit breaking apparament-thc character described comprising anoil switch mechanism, automatically opened switch mechanism exteriorlyof said oil switch, said. switch mechanisms being serially included inthe-same circuit,` and means for actuating both saidswitch mechanismscomprising a series of levers held in unstable equilibrium when saidswitches are closed.

1 8. A circuit breaking apparatus of the character 4described com risingan oil switch mechanism., a'n air hrea switch mechanism automaticallycontrolled thereby, means for actuating said air break mechanismcomprising a. series of lei-'ers supported in un'- stable equilibriumwhen said air break is closedglmeans' whereby the support for saidactuating means is-withd'rawn when said oil switclijs opened to opensaid air break; and means :for retarding' the opening movement of saidair break mechanism.

19. :A circt breaking mechanism of the character described-'comprisingan oils'witch and 'inecliaismj'for actuating thefsame', an airbreakswitch and mechanism toi' actuating ,thsame associatedfwithsaid 'oilswitch actitiiig'nechanism and' no rmally. au toitilcall'y 'controlledthereby', and f'riieans for dis'establishigwthe Vant'omat'ic" 'controlof said' air'break' switch'actuating mechanism by=saidoilswit`chfjactuating mechanism.

'QO'ff'ciciiit breaking mechanism of the character described comprising4an oil switch ad" mechanism' Ifor actuatln the same, an aii'` breakswitchan'd mechanism for actuating' the; sa-mc associated with said oilvswitchactuatingi E,'1'nb',cliani'sm and normally" automiitillyc'iit'rlled thereby,l and 'means for locki'n'gf's'ad" air 'beakswitchactuating mechanism to'hold saidair break switch in closede'pos'itio'nsoE that said oil switch 'actuatin 'mechanism 'may beoperated indepenently thereof.

21. A circuit breaking mechanism of the character described comprisingan cil vswitch mechanism, an' air break mechanism 'associated with' saidoil switch mechanism and normally .automatically controlled ft-hereby,and meanst for -simultaneously locking both of =sa;id switch mechanismsin open position.

22. A circuit breaking mechanismcf the character des'cribedcomprising anoil'switch mechanismi-an air break' mechanism associated with said oil'switch mechanism and normally automatically controlled thereby,

:said air break' mechanism comprising an operatingjarm pvotally mountedon the switch frame, and means cooperating with th'e'free en d ofsaidarm for locking both of. said switchyme'chanisms' in open position.

23,. A '.jcireuit breaking;r apparatus o'f the character describedcomprising an oil switch mechanism. automatically1 opened air break lit'lili

lll)

switch lmechlmism ,exteriol'ly of said oil switch, said switchmechanisms being ser-i- :illy included in the .same circuit, ,means foractuating cach of said ewiljol-i mechanisms comprising :i sex-ics of:leviers gummi-tml ,in unstable equilihnium 'Mhensnid ojlsivitch .isclosed, and intcrengazing means oueeiql gw.- tuuting .means when )y thefemoral oi the suppmfting menus .of tzhe oil switch' actuating meanswill remove the Signum-.t ffm' .the nir break actuating means to .openseid .ahr break.

24. A ciucuit hmakiug apparatus ci .the character described comprising,en oil switch mechanism, an ,ahbreuk switch metalen-tieni automatically.controlled thereby, me-.tus 0.1- ncl'uating said :Lhbreak mechanismcoin- |1rising :l Hel-.ies of levers Supported ,in itunstahle.equilibrium when sia-id ai; hzfenk ,is closed. und means .wheizel-xythe support for said actuating means is withdrawn lwhen said @il switchis .opened to .open said air break.

25. A .circuit bucking mechanism ef the character descnihed .comprisingl an foilswitch mechanism, an air break mechanism .essor ciated .withsaid switch mechnnirsmnd normally autemetoelly comfrlled thereby, :indmeans .for .opemting sgtidwitclf meetic nisms .independently .oeachother .to .lopen Mld dese. the A `oil-4 .Sinith mechanism .when thefbreak .mechanism is open or closed and to open and `close .the airbreak .mechanism when the. .eil switch: mclmnem is o en.

p26- .A .circuit .breaking mechanism of theclmazactendescnihelicomprising, un oil :six-.itch mediensm, en wir.hxeels mechanism essocialted with ,said oiljswitchmechenm @intlnomnelly. automatically: controlled thereby, nndjueans foqrlockilggxsaid ait break open position 'so .th'iltlaid ci] switch mhan'mmcy be manipulete menemicutiy thelaeof without 1c..os.ngif .the.cinc-.uit comprising said oil and air 'break mechatmsms. l

2T. circuit fluzellinkg mtjltihfsm ,off the uitgemeten* lesmil'iedoniln'iemgia11-oizllsxwitch mechnfniem, :u1 aia' hveak'cneehanin asso#ciafted with scid foil sgviteh-fmechimism and nermally eutomieteailhyiemitrekled thereby, and mems for leckingsidcil Swtdl mech a-e'nm in@een peitie .Se het @id mir lblteak 111echeeism111$y he manipulatedjndependf entlgf thereof withfmt .ele'ein the @zenit comprising smidvoi-l and agir 1 Beek meel-1:3,-`

A cnoetbreaiking mechanism off the character described comprising @n o;1.swt;ch mechaniem, am .air .hneek mechefnsm assoc'mted with Said .oil.Switch Ime lie1n.sl;1.1 and norma-ily automaticallyfeontrolled thereby,said air hneaksmechimam .com n-sing an operexting :ulm @isnt-ally.l-nmunte -on .the e-Witch frame, and Ineens codici-Miam .with theincl-- end of said ,erm tor i ilsestnbllshing the mi.` toiuatic controlof said klifllll*tihl"mcklul nisam hy Sui-d oil stri-tdi ,mcchainiin Aciucuit hreaflciug mechanism of .th:. churqieterdescribed col-uprisingtu oil mitch mechm-isi-n, mi nir break mechanism assu.- ciated with Saidoil switch mechanism .uJld normally automatically controlled l'lwrehgv,said air breek mechuiriis-m con-iprising n n .operatinge-rm pivotallymounted .on Ythe switch frame` and means cooperating wilt-h the fr ceend of said arm for lock-ing Suid air break mechanism in ,closedposition su .ihzu said oil su'ih mechanism may he operated indopcndel-1t y the-recit.

30. A circuit breaking mechanism ul" the character described compviingun oil witc-h inechunisi-n. en nir breuk ufiechuniem A4550A cinted withsaid oil switch -nieclutuism ,und normally automatically controlledhhcneby, said air breuk 'mechanism comprising non erating arm pivotallymounted lon -th` switch frame, and means eccoci-airing .u1-ith ,the timecnd .of said arm for 4locking -said air break mechanism in open positionso .that Suid :oil switch mechanism may be -opemted inde pendentlywhereof without .closing .the circuit compgzislng said oil and nirbrezil; mecha.- nisms.

31. A circuit breaking.,mechanism oft {ih e character rdescribedeQmWs-ingn oil serv-.tch mechanism, Aam air break mede-intiem asso.ciated whh said oil'lswiftc-h mec-hamlsm und normally autonmticafllycontrolled qtheneh, said air break mechanism compnising um operating armpivotelly mounted op the switch frame, said ar-m heingprovided with ,n,peurtion extending ol-rwerfl'ly fiom the pivot. theaseef, :e Stetionmzyerm mounted en the switch .framework .und 'means ,051- .locking saidoperating :ar-m to gsaicl ,statiche-ry man in a ,plurality ofgpositipons.

.32. A A. 'uscuit breaking .mechemism of .the character describedcimpnishgg am .oil switch nlecl-ianism, an .ui-rv hren-k mechznism agisciai'ed with said .oi-.l switch mechanism and normally .autonmtvultycontrolled tunnel-5i. Suid air'hreuk mechanic-,m coinpnieing un up.-erating arm 1.'wotu-lly ,muwed on thefSWiQh fname, sse-idem haring aPorti@ lemmi@ formal-.ally Enom .its'iaimog eaid ffomgerdfngxtendingportion being @noci-ded with en opening, la, -.stutiona-ry umn mountedou the switch fnxunewou c mm1 plaoa'ded Vith .open ings with which theopening in ,said openaiing erm' .is adapted t0 be aligned, mid .ineensadapted .to he ,passed through n pair 0f aligned-openings to locksnidopenztting mim in a plurality ,of fpositions.

In witness whereof, I .have .hereunto set -,125

my hand this `1st day of May, 1220.

WlLLIAM POOLE DRY-ER.

llhl

